import router from './router'
import store from './store'
import { Message } from 'element-ui'
import NProgress from 'nprogress' // progress bar
import 'nprogress/nprogress.css' // progress bar style
import { getToken, getJWT } from '@/utils/auth' // get token from cookie
import getPageTitle from '@/utils/get-page-title'

NProgress.configure({ showSpinner: false }) // NProgress Configuration

const whiteList = ['/wx', '/login', '/auth-redirect'] // no redirect whitelist

// 用于在路由跳转前执行逻辑，常用于权限验证、用户身份认证、数据预加载等场景。
// 使用 next() 可以控制路由是否继续执行，甚至进行重定向操作。
router.beforeEach(async(to, from, next) => {
  // start progress bar
  // 用于在网页上显示进度条。NProgress 是一个非常轻量级的进度条库，
  NProgress.start()

  // set page title
  document.title = getPageTitle(to.meta.title)

  // determine whether the user has logged in
  const hasToken = getJWT()
  // const hasToken = store.getters.jwt
  console.log('是否登录', hasToken)
  if (hasToken) {
    console.log(to.path)
    if (to.path === '/login') {
      // if is logged in, redirect to the home page
      next({ path: '/' })
      NProgress.done() // hack: https://github.com/PanJiaChen/vue-element-admin/pull/2939
    } else {
      // determine whether the user has obtained his permission roles through getInfo
      const hasRoles = store.getters.roles && store.getters.roles.length > 0
      if (hasRoles) {
        next()
      } else {
        try {
          // get user info
          // note: roles must be a object array! such as: ['admin'] or ,['developer','editor']
          const { roles } = await store.dispatch('user/getInfo') // 获取用户信息，可能会 reject('未登录') 这是error

          console.log('permission.js 1', roles)
          // generate accessible routes map based on roles
          const accessRoutes = await store.dispatch('permission/generateRoutes', roles)
          console.log('permission.js 2', accessRoutes)
          // dynamically add accessible routes
          router.addRoutes(accessRoutes)
          console.log('permission.js 3', accessRoutes)

          // hack method to ensure that addRoutes is complete
          // set the replace: true, so the navigation will not leave a history record
          next({ ...to, replace: true })
        } catch (error) {
          console.log('permission的内容重置token', error)
          // remove token and go to login page to re-login
          await store.dispatch('user/resetToken')
          Message.error(error || 'Has Error')
          next(`/login?redirect=${to.path}`)
          NProgress.done()
        }
      }
    }
  } else {
    /* has no token*/
    console.log('to.path', to.path, whiteList.indexOf(to.path))
    if (whiteList.indexOf(to.path) !== -1) { // ；如果元素不存在，则返回 -1。
      // in the free login whitelist, go directly
      next() // next() 是一个用在路由守卫（如 beforeEach 或 beforeEnter）中的函数。它的作用是决定是否允许导航继续执行。
    } else {
      // other pages that do not have permission to access are redirected to the login page.
      next(`/login?redirect=${to.path}`)
      NProgress.done()
    }
  }
})

router.afterEach(() => {
  // finish progress bar
  NProgress.done()
})
